Deleting data from database by user input
There are different programming languages currently in use, of which some are open source while others are proprietary. Open source basically refers to a program in which the source code is available to the public, free of cost, for use or for modification from its original design.
Here we will Deleting data from database by user input for which we will use programmatic method with the help of PHP and MYSQL .
Syntax of PHP
<?php
//Content goes here
?>
deletingdata.php
<!DOCTYPE html>
<html>
<head>
<title>Deleting Data</title>
<style>
body {
background: linear-gradient(to right, #1e5799 0%, #3ccdbb 20%, #16c9f6 100%);
}
.form-css
{
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
position: absolute;
background-color: white;
border: 2px solid black;
border-radius: 20px;
padding: 50px;
}
.avatar-image img
{
justify-content: center;
top: 0%;
left: 50%;
transform: translate(-0%, -50%);
position: absolute;
border: 1px solid black;
border-radius: 50%;
}
button {
font-family: sans-serif;
padding: 5px;
cursor: pointer;
}
</style>
</head>
<body>
<div class="container">
<form action="controller/deletingdata-db.php" method="POST" class="form-css">
<div class="avatar-image">
<img src="image/avatar.png" alt="avatar">
</div>
<br />
<br />
<label>Delete Data with ID Number</label>
<br />
<br />
<input type="text" name="id" placeholder="Enter ID Number">
<br />
<br />
<button type="submit" name="submit">Deleting Data</button>
</form>
</div>
</body>
</html>
Then again we will create a new file called deletingdata-db.php and this file related with above the program for database as a mediator.
deletingdata-db.php
<?php
require_once("connectionstring.php");
$id = $_POST["id"];
if(!$conn)
{
die("Connection Problem : " . mysqli_connect_error());
}
$sql = "Delete FROM logintable WHERE id='$id'";
if(mysqli_query($conn, $sql))
{
echo "<br>";
echo "<br>";
echo "It has been deleted.";
echo "<br>";
echo "<br>";
echo "<a href='../gettingdata.php'>Getting Data From Database</a>";
echo "<br>";
echo "<br>";
echo "<a href='../deletingdata.php'>Deleting Data From Database</a>";
}
else {
echo "<br>";
echo "<br>";
echo "Error. This name does not have an ID in our Database : " . mysqli_error($conn);
echo "<br>";
echo "<br>";
echo "<a href='../gettingdata.php'>Getting Data From Database</a>";
echo "<br>";
echo "<br>";
echo "<a href='../deletingdata.php'>Deleting Data From Database</a>";
}
mysqli_close($conn);
?>
output
Explaination
=> require_once("connectionstring") - This will
produce a fatal error and stop the script.
OR
=> include()
- This will produce a warning and the script continue.
=> $conn is our new variable.
=> mysqli_connect() - The
mysqli_connect() function attempts to open a connection to the MySQL Server
running on host which can be either a host name or an IP address.
Passing
the NULL value or the string "localhost" or variable name to this
parameter.
Now we will check the connection whether the connection
is working successfully or not!! Actually here we will "if and
else" condition.
=> die() - The die()
function prints a message and exits the current script.
=> mysqli_connect_error() - This will produce a mysqli connection error and whats the reason of
failure.
=> $sql - its a variable but in this
variable we store the mysql query for select id, email
password from
table according to user input ID.
=> mysqli_query() - mysqli_query() what it returns. The return value could be a
boolean(true/false)
Disclaimer
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